Automatic recording-scale.



y E. McGARVEY. AUTOMATIC RECORDING SCALE. APPLICATION FILED MAR- 19x0.

Patented A '10, 1915" 4 SHEETS-SHEET 1- E. McGARVEY. AUTOMATICRECOR'DI'NG SCALE.

APPLICATION FILED MAH- I4. 1910- Patented Au'gi 10,1915.

4 SHEETS-SHEET-2'- E. McGARVEY. AUTOMATIC RECORDlNG SCALE.

. APPLICATION F|LED MAR, |4| 910v 1,149,378. Patented Aug. 10, 1915.

E. McGARYEY. AUTOMATIC RECORDING SCALE.

APPLICATION F|LE D MAR. '14, 1910. 1,149,378.

4 SHEETSSHEET 4.

P'Lla Patented Aug. 10, 1915.

UNITED STATES PAThNT @FFIQE.

ED'WARD MGGARVEY, 0E BELLEFONTE, FENNSYLVILNIA, ASSIGNOB T0INTERNATIONAL ELECTRIC COMPANY, OE BELLEFONTE, PENNSYLVANIA, ACOBFDRATION 01* AR ZONA.

AUTOMATIC REGORDING-SQALE State of Pennsylvania, have invented certainnew and useful Improvements in Automatic Recording-Scales, of which thefollowing is a specification, referencebeing had therein to theaccompanying drawing.

My invention consists of an improvement in weighing scales, moreparticularly the class of automatic recording scales.

It has for its object to piovide a scale mechanism in which the poisebeam is provided with an adjustable poise controlled by a motor subjectto circuits effected by contacts which are made and broken by the poisebeam terminal or other equivalent contact mechanism, operating to shiftthe poisein either direction until the beam is poised, at which positionits terminal is out of contact.

The invention also embraces means for reversing the current of themotor. means for actuating printing wheels to positions correspending tothe proper weight to be indicated, depending upon the amount of rotationof the feed screw for the poise; means for actuating. and controllingprinting mechanism so that it willprint only at the time when the beamis in equ -poisc and to various other features of construction andoperation as shall be more fully hereinafter described.

Referring to the drawings: Figure l is a view of the poise beam of a.scale and its parts in sideelevation. Fig. 2 is a longitudinal sectionalview centrally therethrough indicated by the line II. II. of Fig. 3.Fig. 3 is a plan view of Fig. 1. Fig. 4- is a detail view of themagnetic clutch in ele vation. Fig. 5 is a cross section on line V.

IV. of Fig. 4.. Fig. is a similar view on line VI. VI. of Fig. 4. Fig. 7is an enlarged view in elevation of the terminal contacts for thevibrating end of the beam. Fig. 8 is an enlarged cross section throughthe poise on the line VIII. VIII. of Fig. 3. Fig.

9 is a similar view of the printing mechanism on the line IX. IX. ofFig. 3. Fig. 19

a detail view of one of the beam-contactoperated motor relays. Fig. 11is a detail view of the'printing relay and retard mechanism. Fig. 12 isa diagram of the circuits.

Referring tothe drawings, 9. is the usual Specification of LettersPatent.

Patented An 10, 12915..

Application filed March '14, 1910. Serial No. 549,204.

balancing beam of a scale mounted by knife edge bearings 3 in anysuitable support, as from the cap of a scale frame. The beam 2; is inthe form of a rectangular framework having two o 'ipositcly arrangedside bars 4, 4, oined at their ends by cross bars and 6 respectively ofany suitable construction, the end 5 providing l ratings for the outerend of the poise feed screw and for mounting of the terminal contactelement, the inner end- (i providing a bearing for the motor shaft.

7 is the adjustable poise mounted by carrying wheels 8, at each side, onsupporting tracks 9 along the upper edges of bars 4, provided with aninternal nut 10 pressed into engagement with the threads of a feed screw11 by any suitable spring mechanism 12, whereby the poise is placed infeeding engagei'nent with the threaded shaft 11. It will thus be seenthat upon rotation of the shaft 11 in either direction the poise 7 maybe located at any position on the beam to operate in the same mannergenerally as in the ordinary poise of the usual weighing scale. One ormore additional nuts 10 of blade form are preferably provided at thefront and back of the poise, pressed toward the shaft by a top springplate 12 the purpose of which is to clean the threads of all dust, etc.By means of these spring-actuated nuts all wear of the threads is compensated..for. thereb. -i. 'oiding all lost motion and insuring accuracy ofoperation.

The machine is designed to operate automatically. so that the poise willbe located at the proper position, dependent upon the weight of thegoods or article being weighed, and for the purpose of'ac'tuating thescrew ll in either direction I provide a motor M, the armature of whichand shaft 13 rotate in the usual way between the fields of the motor.Shaft 13 is provided at its outer end with a bearing terminal mounted inany siutable bearing 14 in the end 6 of the beam and is coupled at itsinner end ,with a magnet 15. It is designed that the screw shaft l1shall be subject to magnetic clutch en- The construction of the magneticclutch train of confine-U spy" curmurost mm 1.0

secure ati on wing w the 1 :1 round 'Jl el'ini'ned L v bun."

llciw m i n ech 91" A. L.

aqniqoifiea n-inting mechanism is 11:1

ztio'ns. as shall now lapse to he m'nmf gear;

:lnism advan iii'n mvchfimod Hub 16. 111-10 '90 e azhdmw t 11; its

we train 0 no prim '29; against 'prvrnntlu'e V2. have illusoi: the mmthi Index.

can "id erg ough 6 .vi H5130 'Vith l. Ensurh of. mm. Fig.

vix'h and (f-Joby H1011 m Min 1 wossm-y electrical Clement he swwrzz!ibed. It

:1 in 'niwi vido posiiii m. opera ins natu m.

are

if platestop m an an 11% level" mimrd In. by

prm

that in which terminal 26 is in contact with terminal 27; and theintervening position. Also, that in order to operate the mechanism themotor must be alternately reversed so as to shift the poise 7 back andforth until it finally arrives at the desired position for the printingoperation to be performed.

vlfihen the beam is down in the trig loop or in other words, when thepoise is beyond the balancing position, the flow of current from thesource of supply is as follows: A and B represent the main conductingwires from any source of electrical energy The current flows f omconductor A to switch S, the function of which is to throw the entiremechanism into or out of operation, and to the distributing point C onthe beam. Here the conductors are divided, the current flowing byconductor 0 through the magnets 30 of the printing relay P, R, andthence by conductor Z to magnetic clutch 15, from thence by conductor eto magnets 25 of the stop mechanism, and from thence by conductor a toterminal contact 26 on end of beam. From lower contact'28 by conductor fto the magnets 41 of relay D; by conductor 9 to lamp resistance 42thence by conductor h to main conductor B, the opposite side of suppiy.

in Fig. 10 I have shown in detail, one or" the motor relays I). Theopening and closing armature d is pivotally mounted at d and connectedwith the field connection j and is normally. retracted by a spring 3 andlimited as to its movement by set screw (1 When magnets 41 are energizedthrough either conductor f or q and main line concontacts with bindingductor g, armature d from, field magnet post d closing the circuitconductor to motor conductor'n. it will moving ance, and slightlybeyond, such movement being accomplished by thus be seen that in theopen position o1 the relay the armature lever lies against the limitingstop (5 and after the circuit is closed by the beam contact 26 anappreciable period of time will elapse while the'armature lever towardthe magnet and into contact with (Z establishing connection with themotor.

However, on the opening of the beam circuit, connection is brokeninstantly. In this way, for any period of time that (the beam circuitmight be will be closed fora shorter period, and the action will be asfollowson the beam coming to balance: Assuming the poise, 7 to be in aposition of several hundred pounds variation from the point of balance,the relay D will close and operate to start the motor,

the poise toward the point of bala very rapid movement or the motor'M,say 1200 R. 11 M.

point of moves from its position of restclosed, the motorcircuiteffect'mf the are is counteracted by adjusting the return spring(Z on the relay so that an appreciable weakening of the beam circuit,even if still maintained through the are from the Contact, will operatethe relay. From the above it will be seen that the adjustment of themotor relays is dependent to a certain extent, like the printing relay,on the time of vibration of the beam. The operation of the motor relaysin this manner contributes to the practicable operation of the machineas follows: First: They do away with a multiplicity of contacts on thebeam. Second: By splitting the current used into different independentcircuits they obviate the faults produced by burning when a heavycircuit is broken. Third: They operate to bring the beam more quickly toa balance, as follows: Assuming the moving mechanism operating the poisecomes to rest instantly on the breaking of the circuit at the beamcontact (26, 27, 28), two factors still operate to carrythe poise fromthe balance. First, the beam along with the weight of the scale, due totheir inertia, does not immediately start to swing on coming to anabsolute balance, and there-. fore an appreciable amount of timeelapsesafter the poise has arrived at the balance point before the beam leavesthe upper or lower contact, during which time the poise is still moving;and, second, on the breaking of any circuit conveying electric current,an arc is formed at the breaking point, thus supplying current to themechanism a small fraction of a second after the beam has left the upperor lower contact. Both of these distributing points C by conductor 2' tothe fields b of the motor Mend field Wire j to contacts (Z and e ofrelays D and E respectively. Relay D being closed at this time under theinfluence of magnets 41 establishes circuit by post (1 and conductors kto wires Z and n and armature m of the motor, connecting wire n leadingfrom the other side of the motor to contact post 0?. Through conductor 0circuit is established through lamp resistance 43 to the other mainconductor B. When the beam is at the upward position, the operation isthe same, except that curnew; -1-

lield W i re 3 e115. iriterpose compensat- .JSIU, circuits and contacts7 1e inmement of the beam for he r 'on of the motor. 4

it The combination with a scale beam, of

a poise, :1 )oisc-o; .v screw, on electric actor 1'1 A "1e screw, meansconl ollcil by th: t c c o mngne l tor directly coupling the motor 211screw together, means controlling the clutch ccpendent on the position.of the beam, iyiq'le-imcels controlled by the screw, m'iiitii jmechanism, and operating means tieiw'zjlir con )ll(( by the posiion ofthe The combination with the beam, its poise, the -operz1ti11g screw, ofan electric motor ior (qieihting the screw, means vie earn. for opeotingthe motor, a 1'l1l l1tl clutch directly coupling the motor and. thescrew, means controlling the ciutch dependent on the position of thebeam, type-iiiechzinism mounted on the screw, electricallycontrolleclmeans for moving the '75 echricislm. contacts for said elcctri-=-cohtrollecl means, and a, contact on the )tecl to close the circuitsof said.

electrically-col 'olled means.

c. The combination with {L scale beam, a

con, :i 1836. screw therefor, an elecfor actuating the feed screw,

retic- ElU' 'C interposed. between the 3110' id the feed :crew fordirectly coupling other of t 'Je Wheels controlled.

)rintin mechanism, and.

, controlleo by the position of the l (M5111 for operz iting; the motorand. the printmeclmnisni.

,, 'lhe coml'iinution with the poise beam,

the poise fecdiii screw, 2. poise onl'saicl screw, 5m electric motor andits shaft for actuating said screw, of means independent the motorlllltl. it; sl'irz'lit, controlled by the l, for locking the screw Ioilix my signature

